ASTM A304-20 - 1.7.2020
 
1. Scope

1.1 This specification covers hot-worked alloy, carbon, and carbon-boron steels in a variety of compositions and sizes, which may attain specified depth of hardening in the end quench test. These steel compositions are identified by the suffix letter “H” added to the conventional grade number.

1.2 This specification provides for analyses other than those listed under Tables 1 and 2. Special hardenability limits are also permissible when approved by the purchaser and manufacturer.

1.3 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

 
2. Referenced Documents

J1086

Numbering Metals and Alloys

E112-13(2021)

Standard Test Methods for Determining Average Grain Size

A255-20a

Standard Test Methods for Determining Hardenability of Steel (Includes all amendments and changes 11/16/2020).

A108-24

Standard Specification for Steel Bar, Carbon and Alloy, Cold-Finished

A29/A29M-23

Standard Specification for General Requirements for Steel Bars, Carbon and Alloy, Hot-Wrought

E527-23

Standard Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)